How hard is it? I took Physics C senior year, and plan on solidifying my knowledge over the summer. I'm thinking EE. Would taking the class be a good learning experience? Also, what are the questions like? I can't seem to find any good sources online. Thanks.

No one can answer for you how hard it will be, but I hear it is a decent amount of work. 40s are easy for someone who has taken AP C IMO. Just take 60 if it interests you. You can always drop it, and if it is the only hard class you have then it's no big deal.

I had a rough time. Got through the first two but couldn't do the third, which I think had something to do with the problem sets being 4 chapters ahead of lecture by the second week. But I only did Physics B in HS.

Also, if it's still at 9:00 but you want to keep typical "I'M A FRESHMAN AND I CAN SET MY OWN HOURS!!!!!" hours then you're definitely going to have a rough go of it.

If you're thinking EE then there's really no point to 60, unless you're particularly interested in a more intense physics load. The nice thing about 60 is it gets you somewhat more prepared for the later physics courses, but you won't be taking those. (I have no idea what, if any, more advanced physics is required in EE, but I believe it's through the EE dept. and I doubt it's quite as rigorous as the second- and third-year E&M and QM courses in physics.)

This was in 2005-2006, so a bit over 7 years ago at this point, I can't give you an example problem. It's also possible things have changed since then. It certainly wasn't an easy A, as those were pretty much the only A's I got (I wasn't the best worker, lots of things I'd do differently in hindsight, although honestly it didn't matter much, I'm in a physics-related job now). But I think you're pretty much guaranteed a B or better if you at least try to do the work.

I'm an ME (almost went EE though) and I had a pretty rough time. I took the Physics C tests in high school without having really taken a physics C class. Not sure who the 61 lecturer will be for you, but whoever it is has to be better than Lenny Susskind at teaching intro physics.
The 63 prof, Peter Graham, is a fucking champ. That class is the best in the series, and seriously one of the better classes I've taken. Don't get me wrong--you'll still spend hours and hours staring at problems at office hours, but he's actually a really engaging professor.
things I wish I knew before diving into the 60 series: coffee is an acceptable crutch when the alternative is falling asleep in 9:00 lecture every day.

As someone who breezed through Physics B and C in high school, I will say that the 60 series is a ton of work (mostly from a problem set perspective). 40 series is very easy by comparison--basically a rehash of C from high school.

The 60 series are a great learning experience, they're what decided me on being a physics major and eventual grad student in physics. That being said, the problem sets take a lot of time (you're covering a lot of in depth material, and the best way to learn is to work problems). The curve wasn't harsh, but you had to put in the effort. If you want an easy A, they really aren't the way to go.

If you really want to get a good handle on physics though, it's really the best choice. Physics majors who took the 40 series had a lot of catching up to do in upper division classes.